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(Last Modified On 6/18/2013)
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(Last Modified On 6/18/2013)
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Genus
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Porophyllum Guett.
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PlaceOfPublication
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Hist. Acad. Sci. Paris Wtm. 1754.
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Note
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TYPE: Cacalia poro- phyllum L. = Porophyllum ruderale (Jacq.) Cass.
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Synonym
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Kleinia Jacq., Enum. PI. Carib. 8. 1760, not Kleinia L. 1753. TYPE: K. ruderalis Jacq. Hunteria Moc. & Ses. ex DC., Prodr. 5: 648. 1836, pro syn.
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Description
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Glabrous or pubescent, often strong-scented, annual or perennial herbs or shrubs; stems terete or weakly angled, leafy, erect. Leaves alternate or opposite, simple, sessile or petiolate; blades linear to ovate, variously punctate with oil glands. Inflorescence cymose, corymbiform, paniculiform, the heads solitary or few at ends of branches, pedunculate. Heads discoid; involucres cylindric to campanulate, the bracts uniseriate, 5-9, narrow, free or basally fused, variously punctate with oil glands; receptacle flat or slightly convex, naked; florets all perfect and fertile, the corollas whitish, yellowish, greenish or purplish, short- to long-tubular, the throat very short to longer than the tube, equally to somewhat unequally 5-lobed, the anthers rounded to weakly sagittate, the appendages short, rhombic or triangular-acute, the style branches long, slender, hirtellous. Achenes cylindric or narrowly obpyramidal, striate, variously pubescent; pappus of numerous slender, scabrid bristles. Chromosome base numbers x = 11, 12, 15.
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Habit
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herbs or shrubs
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Distribution
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Porophyllum, a genus of about 28 species, is widespread in the warmer areas of both North and South America.
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Note
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Several of the species have highly disagreeable odors. In Panama, Porophyllum is represented by a single species, P. ruderale. The systematics of Porophyllum have been studied recently by Johnson (1969). A useful earlier reference is the one by Rydberg (1916).
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Reference
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Johnson, R. R. 1969. Monograph of the plant genus Porophyllum (Compositae: Helenieae). Univ. Kansas Sci. Bull. 48: 225-267. Keil, D. J. & T. F. Stuessy. 1975. Chromosome counts of Compositae from the United States, Mexico and Guatemala. Rhodora 77: 171-195.
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